One-man quartet Tyler Mancuso sings selections from Psalm 103 (104 in the Masoretic numbering) at the Antiochian Village Summer Camp:
His YouTube page states that he doesn’t use autotune; his variations are his own and recorded separately. I don’t know how Mancuso integrates the tracks, but I find the timing impressive.
I imagine that Mancuso entertains the campers well, though here we see the superiority of a real (multi-membered) a capella quartet. Four fellows can charm and wow an audience without any additional equipment—even at a rustic auditorium in the woods. Mancuso’s gift is better appreciated online. At camp, Mancuso probably joins with other campers and staff to sing. The Orthodox have plenty of singers!